On Thursday 11 December 2008, Gilad Shainer wrote: > On the maximum BW you are correct - IB is capable for 16Gb/s data rate. You > are seeing 12Gb/s due to the host chipset bandwidth limitation.
Using a few more words, IB DDR on PCI-express 8x gen1 does not reach its full potential (12/16 Gbps sounds about right). To max out IB DDR you'd need PCI-express 8x gen2 or 16x gen1. The former is available (for some combinations of HCA and host chipset) and yields a performance quite close to 16 Gbps. /Peter > Gilad.
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